Internal powder feeding type high-energy plasma spraying manufacturing method of refractory metal heavy load wear-proof coating

Abstract

The invention relates to an internal powder feeding type high-energy plasma spraying manufacturing method of a refractory metal heavy load wear-proof coating. Mo powder is used as the raw material ofthe coating, and the coating is obtained on a metal base material by means of an internal powder feeding type high-energy plasma spraying method. By the adoption of the internal powder feeding type high-energy plasma spraying manufacturing method of the refractory metal heavy load wear-proof coating, by means of reasonable thermal spraying technological parameters, the spraying technological process is strictly controlled, so that the porosity of the coating is reduced, the breaking tenacity of the coating is improved, and the comprehensive mechanical property of the coating is greatly improved; the hardness difference between a coated part and a counterpart is small, three-body wear caused under heavy load conditions is avoided, the friction coefficient and wear rate are lowered, the wearresistance is greatly improved, and the service lives of all types of metal parts are effectively prolonged.

Description

technical field

[0001] The invention belongs to the field of metal surface modification, and in particular relates to a method for preparing refractory metal heavy-duty wear-resistant coatings by internal powder-feeding high-energy plasma spraying. Background technique

[0002] In the modern industries of aerospace, automobile, metallurgy, machinery, and railway transportation, heavy-duty conditions widely exist in parts such as ball valves, engine main shaft bearings, gearbox gears, and vehicle clutch release rings. The wear form under heavy load conditions is mainly abrasive wear, accompanied by erosion wear, adhesive wear, oxidation and fatigue spalling. Surface modification can improve the wear resistance, corrosion resistance and oxidation resistance of metal parts under heavy load conditions, thereby greatly improving the service life of metal parts.

[0003] For the failure of heavy-duty metal parts, commonly used surface modification methods include nitriding, surfa...

Examples

Embodiment 1

[0037] In this embodiment, 20Cr13 martensitic stainless steel discs are used as the substrate, the size is Φ43×5mm, and the mass percentages are: 0.16 to 0.25% of C, ≤1.0% of Si, ≤1.0% of Mn, ≤0.035% of P, ≤ 0.03 of S, ≤0.6 of Ni, 12-14% of Cr and the balance of Fe.

[0038] The coating is a high wear-resistant coating with a thickness of 300 μm on the surface of the stainless steel disc, and the coating material is Mo metal powder.

[0039] The particle diameter of the Mo metal powder ranges from 22 to 60 μm; the purity of Mo in the metal powder is greater than or equal to 99% by weight percentage.

[0040] The specific implementation steps for preparing a high wear-resistant coating on the surface of stainless steel discs by using the internal powder-feeding high-energy plasma spraying method are as follows:

[0041] 1) Substrate surface pretreatment

[0042] The surface of the stainless steel wafer as the substrate is first degreased, decontaminated, polished and derusted...

Embodiment 2

[0047] In this embodiment, the material of the ball valve core is 40Cr13 martensitic stainless steel as the matrix, the size is Φ43×5mm, and the mass percentages are: 0.36-0.45% C, ≤0.6% Si, ≤0.80% Mn, ≤0.035% P of ≤0.03%, S of ≤0.6%, Ni of ≤0.6%, Cr of 12~14%, and the balance is Fe.

[0048] The coating is a high wear-resistant coating with a thickness range of 350 μm on the surface of the ball valve, and the coating material is Mo metal powder.

[0049] The particle diameter of the Mo metal powder ranges from 22 to 60 μm; the purity of Mo in the metal powder is greater than or equal to 99% by weight percentage.

[0050] The specific implementation steps for preparing the high wear-resistant coating on the surface of the valve core sphere by using the internal powder-feeding high-energy plasma spraying method are as follows:

[0051] 1) Substrate surface pretreatment

[0052] The surface of the spool sphere as the base material is first degreased, decontaminated, polished a...

Embodiment 3

[0057] In this embodiment, the gear material of the automobile gearbox is 20CrMnTi carburized steel as the matrix, the size is Φ43×5mm, and the mass percentages are: 0.17~0.23% of C, 0.17~0.37% of Si, 0.8~1.1% of Mn, ≤0.03 % of P, ≤0.03% of S, ≤0.04% of Ti, ≤0.03% of Cu, ≤0.03% of Ni, 1.0-1.3% of Cr and the balance being Fe.

[0058] The coating is a high wear-resistant coating with a thickness range of 380 μm on the gear surface, and the coating material is Mo metal powder.

[0059] The particle diameter of the Mo metal powder ranges from 22 to 60 μm; the purity of Mo in the metal powder is greater than or equal to 99% by weight percentage.

[0060] The specific implementation steps of preparing the high wear-resistant coating on the surface of the gear by using the internal powder feeding high-energy plasma spraying method are as follows:

[0061] 1) Substrate surface pretreatment

[0062] The surface of the gear as the base material is first degreased, decontaminated, pol...

technical field

[0001] The invention belongs to the field of metal surface modification, and in particular relates to a method for preparing refractory metal heavy-duty wear-resistant coatings by internal powder-feeding high-energy plasma spraying. Background technique

[0002] In the modern industries of aerospace, automobile, metallurgy, machinery, and railway transportation, heavy-duty conditions widely exist in parts such as ball valves, engine main shaft bearings, gearbox gears, and vehicle clutch release rings. The wear form under heavy load conditions is mainly abrasive wear, accompanied by erosion wear, adhesive wear, oxidation and fatigue spalling. Surface modification can improve the wear resistance, corrosion resistance and oxidation resistance of metal parts under heavy load conditions, thereby greatly improving the service life of metal parts.

[0003] For the failure of heavy-duty metal parts, commonly used surface modification methods include nitriding, surfa...

Examples

Embodiment 1

[0037] In this embodiment, 20Cr13 martensitic stainless steel discs are used as the substrate, the size is Φ43×5mm, and the mass percentages are: 0.16 to 0.25% of C, ≤1.0% of Si, ≤1.0% of Mn, ≤0.035% of P, ≤ 0.03 of S, ≤0.6 of Ni, 12-14% of Cr and the balance of Fe.

[0038] The coating is a high wear-resistant coating with a thickness of 300 μm on the surface of the stainless steel disc, and the coating material is Mo metal powder.

[0039] The particle diameter of the Mo metal powder ranges from 22 to 60 μm; the purity of Mo in the metal powder is greater than or equal to 99% by weight percentage.

[0040] The specific implementation steps for preparing a high wear-resistant coating on the surface of stainless steel discs by using the internal powder-feeding high-energy plasma spraying method are as follows:

[0041] 1) Substrate surface pretreatment

[0042] The surface of the stainless steel wafer as the substrate is first degreased, decontaminated, polished and derusted...

Embodiment 2

[0047] In this embodiment, the material of the ball valve core is 40Cr13 martensitic stainless steel as the matrix, the size is Φ43×5mm, and the mass percentages are: 0.36-0.45% C, ≤0.6% Si, ≤0.80% Mn, ≤0.035% P of ≤0.03%, S of ≤0.6%, Ni of ≤0.6%, Cr of 12~14%, and the balance is Fe.

[0048] The coating is a high wear-resistant coating with a thickness range of 350 μm on the surface of the ball valve, and the coating material is Mo metal powder.

[0049] The particle diameter of the Mo metal powder ranges from 22 to 60 μm; the purity of Mo in the metal powder is greater than or equal to 99% by weight percentage.

[0050] The specific implementation steps for preparing the high wear-resistant coating on the surface of the valve core sphere by using the internal powder-feeding high-energy plasma spraying method are as follows:

[0051] 1) Substrate surface pretreatment

[0052] The surface of the spool sphere as the base material is first degreased, decontaminated, polished a...

Embodiment 3

[0057] In this embodiment, the gear material of the automobile gearbox is 20CrMnTi carburized steel as the matrix, the size is Φ43×5mm, and the mass percentages are: 0.17~0.23% of C, 0.17~0.37% of Si, 0.8~1.1% of Mn, ≤0.03 % of P, ≤0.03% of S, ≤0.04% of Ti, ≤0.03% of Cu, ≤0.03% of Ni, 1.0-1.3% of Cr and the balance being Fe.

[0058] The coating is a high wear-resistant coating with a thickness range of 380 μm on the gear surface, and the coating material is Mo metal powder.

[0059] The particle diameter of the Mo metal powder ranges from 22 to 60 μm; the purity of Mo in the metal powder is greater than or equal to 99% by weight percentage.

[0060] The specific implementation steps of preparing the high wear-resistant coating on the surface of the gear by using the internal powder feeding high-energy plasma spraying method are as follows:

[0061] 1) Substrate surface pretreatment

[0062] The surface of the gear as the base material is first degreased, decontaminated, pol...

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